Means for rubbing coated surfaces



- June,7, 1932. E. H. BUCY 1,862,135

Filed Feb. 24, 1928 IN VEN TOR.

/fi ATTORNEYS.

Patented June 7, 1932 UNIT I ATES Emvronn H. BUCY, or wnuiinenm nmnors Mantis FORY'RUBB'ING coA'rEio sUiarAe'Eg v Application filed February 24, 1928. Serial No. 256,578;

This invention relates to means for rubbing surfaces coated with a varnish or lacquer and its object is to provide means by which this method can be carriedinto effect.

E5, The finishing of varnished or lacquered articles is afine art, full of difficulties, which can only be avoided by patient work and keen observation of certain details. To bring out for instancethenatural beauty of wood by giving the finish What is called depth, it

is necessary that the natural gloss of the various undercoats of varnish be dulled and this result cannot be obtained in any other way 4 than by properly preparing the surface. The 1 5. surfacer, performing this operation, must do good work and if he fails, all the subse quent work of varnishing, lacquering, striping, lettering, etc., would be lost. -So'this work requires great care. Varnish, for instance, should stand approximately six days,

depending on the atmosphere, before it can be rubbed with safety. The experienced rubber always tests a surface to find out whether it is still too soft or too green to rub. The

conditions are similar with the quick drying lacquers so much now in vogue. The trend in the industry is to accelerate production at an ever increasing rate and it is therefore desirable to find means and ways whichwill allow to rub varnished or lacquered surfaces sooner than was heretofore possible,fat the same'tiine bringing out a better surface by avoiding the evil results encountered in the prior art if the rubbing was started too early. In the following I shall describe how this result is obtained and shall illustrate in the accompany drawing the means by which I carry my new method into effect. In the said drawing, which is inpart a perspective View and in part a vertical sectional view of the means applied, 1 denotes metal plates of exactly the same dimensions secured by means of wood screws 2 to a wooden handle or board 3 standing on edge. The metal plates 1 are provided with slots 4 in the front and rear in about their middle so as to receive a threaded bolt 5 (shown only in thefront) to which a metal plate 6, of the same dimensions as 1,

is rigidly secured. A strip of felt 7 of the same width as the metal plates 1 and 6 is stretchedacross the lower side of plate '6' and its over-lapping ends are pushed between the plates land 6 whereuponthe same aretightened upon each other. by turning the nut 8 engaging the thread of the bolt. 5. On each side the board 3 is provided with a channel 9 extending perpendicularly through the same and a tube 10 of any suitable material, made preferably of metal, is introduced through said channel downwardly until it terminates immediately .above the metal plate 6. The upperen'd of the metal tubes'lO is continued by elastic m'etal tubes 11 which ultimately join in the pipe 12 which is'connected with a pressure regulator 13 of asour'ce oflcompressed carbonicacid gas, for instance the steel bottle lcontaining such gas. I wish to emphasize that the orifice of the tubes 10 is a relatively fine oneso as tohave the stream ,of carbonic acid gas large enough and can in itself act as a regulator for the flow of carbo nic acid gas.

The construction as shown above is only an example of how my invention can be car- .riedinto effect and it is obvious that I can apply a plurality of tubes 10 terminating above each of the plates 1, that the construction of the device holding the felt pads? in its grip can be shaped or arranged and that, in case such a holdingdevice should not' coin so prise metal plate 6, I may mount the orifice of theftubes 10 immediately above the felt pads 7. and that therefore for the purposes of the invention the combination of the metal plates. 6 and of the felt pads 7stands as a unit for the felt :pad per se. It isobvious that my invention can be installedin any rubbing pad known to the art. I 1

Assumingthata surface has to betreated with oil, for instance linseed oil, and pumice 'stone, I use the rubbing device, illustrated in the drawing; as far as its manualor mechanical operation is concerned, it is similar to that of the devices known forthis pur- I pose, but in-addition thereto I turn on, the

valves of the steel bottle 14 and ofthelpressure regulator 13 and pass a vigorous current of carbonic acid gas through the tubeslO over the metal plates 6'holding-the felt pads Inasmuch as the liquid carbonic acid gas stands in thecylinder 14 under a considerable pressure its expansion from tube 10 re- Q duces considerably the 'temperature'of its surrounding and particularly that of the Inetal'plate 6 and of the underlying felt pad 7 and therewith that of the oil contained in thesam'e; The lower temperature brought aboutby the expansion of the carbonic acid gas is thus also spread to the varnished or lacquered surface which is thereby hardened and can be rubbed much sooner-than was heretofore possible. The hardening of the varnished or lacquered surface also-protects the same from greying which is dueto oil and the fine particlesof pumice getting into n the surface of the varnish or lacquer; It is also ofimportance that the finely powdered pumice stone can exert asharp cutting action on the cooled and thereby hardened surface and on account of this quicker cutting a better effect on the lacquered surface is obtained without running the risk ofhaving the varnishor lacquer pull into folds or the like undesirable disfigurations.

; It will be understood that the operation of carrying my invention into effect, as

faces, the combination of a handle portion and a flat head plate secured thereto, of a me tallic cooling plate spaced from said head plate and detachably secured thereto, a felt I pad extending in contact with the bottom of said cooling plate and-having its opposite ends extending inwardly a slight distance between said head'plate -and cooling plate and clamped therebetweemthe space between said plates I forming an expansion chamber having oppositely disposed gas discharging nozzle slots adapted to dischargea cooling gas directly upon'the coated surface being j rubbeddown, and a source of carbonic acid gas having a dlrect connectlon through the handle portion of the device and terminating in-a discharge nozzle immediately above the surface of the cooling plate, whereby the plate and felt pad will be cooled when the as charged directly upon the work from the opis liberated, and a flow of the gas will be is-.j I

posed nozzle slots to effect the setting of the coating upon the surface of the work. 7 e

scribed above, is only an example of the same 7 andthat this operation may be diversified or any other compressed gas which is inert 'to the coated surface to be treated; it may 7 v for instance happen thatone kind of compressed gas is better to beapplied to one coat and "must be excluded with'another coat. Y It is by no means necessary that the felt pad be secured to the wooden board 3, it may also be secured to any other suitable means serv ing as a handle to hold the felt pad, or other rubbing means, in the plane in which the rubbing has to be done, the condition being that the upper part, or back of this felt pad is sufliciently free so as to allow a current of as,inert to the coat, to escape under pressure fromja nozzle or orifice of a tube terminating or beingdisposed immediately above said o felt pad and to pass in all radialdirections IEDMOND' H. ever.

7 over the same. Only one or a plurality of o felt pads may be joined in the rubbing device just as the'occasion may require. The

I felt pad may be substituted by any suitable rubbing means or-agent, such as a flat piece of pumice and may be secured to the board 3201 its equivalent by any suitable means without resorting to such metal plates as 1 and 6 therefore the plates '1 and 6 may be considered collectively as a unit of means securing the felt pad or'other rubbing means to the wooden handle 3 or any other suitable holder;

'What I claim is; .o 1 c In a device for rubbing down-coated sur- 

